I'm either sitting in the desktop, opening up my e-mail program, or browsing the net. And it will go black. I used to have Win98SE, and I had a similar problem of it freezing instead of going black. I thought it might have been a OS problem, so I went to 2000. And now I still get the occational freeze, but more often I get the black screen. I have no viruses, it's been doing this since I installed the new OS. I used to think it was my video card, but I can play games all day, it has never gone black in a game, it's when I'm doing virtually nothing, or typing a paper, that's when it hits! I kinda think it's my MoBo? Could that be the problem?